Her reasoning is, that she finishes one leg completely, and then goes to the other.
I asked her, what happens if you forget something after you are done with right leg and before the left leg? Her response was "I can still walk".
I dont know. I found it really weird.
As for the your question Tubby,
I usually walk around with a house flipflop or barefoot in summer. In winter, I swap it for a sock if it gets too chilly. But flipflops are fairly standard.